Dose distribution of secondary radiation in a water phantom for a proton pencil beam-EURADOS WG9 intercomparison exercise

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00489292" target="_blank" >RIV/61389005:_____/18:00489292 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1361-6560/aab469" target="_blank" >http://dx.doi.org/10.1088/1361-6560/aab469</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6560/aab469" target="_blank" >10.1088/1361-6560/aab469</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dose distribution of secondary radiation in a water phantom for a proton pencil beam-EURADOS WG9 intercomparison exercise

Popis výsledku v původním jazyce

Systematic 3D mapping of out-of-field doses induced by a therapeutic proton pencil scanning beam in a 300 x 300 x 600 mm(3) water phantom was performed using a set of thermoluminescence detectors (TLDs): MTS-7 ((LiF)-Li-7:Mg, Ti), MTS-6 ((LiF)-Li-6:Mg, Ti), MTS-N ((LiF)-Li-nat:Mg, Ti) and TLD-700 ((LiF)-Li-7: Mg, Ti), radiophotoluminescent (RPL) detectors GD-352M and GD-302M, and polyallyldiglycol carbonate (PADC)-based (C12H18O7) track-etched detectors. Neutron and gamma-ray doses, as well as linear energy transfer distributions, were experimentally determined at 200 points within the phantom. In parallel, the Geant4 Monte Carlo code was applied to calculate neutron and gamma radiation spectra at the position of each detector. For the cubic proton target volume of 100 x 100 x 100 mm(3) (spread out Bragg peak with a modulation of 100 mm) the scattered photon doses along the main axis of the phantom perpendicular to the primary beam were approximately 0.5 mGy Gy(-1) at a distance of 100 mm and 0.02 mGy Gy(-1) at 300 mm from the center of the target. For the neutrons, the corresponding values of dose equivalent were found to be similar to 0.7 and similar to 0.06 mSv Gy(-1), respectively. The measured neutron doses were comparable with the out-offield neutron doses from a similar experiment with 20 MV x-rays, whereas photon doses for the scanning proton beam were up to three orders of magnitude lower.

Název v anglickém jazyce

Dose distribution of secondary radiation in a water phantom for a proton pencil beam-EURADOS WG9 intercomparison exercise

Popis výsledku anglicky

Systematic 3D mapping of out-of-field doses induced by a therapeutic proton pencil scanning beam in a 300 x 300 x 600 mm(3) water phantom was performed using a set of thermoluminescence detectors (TLDs): MTS-7 ((LiF)-Li-7:Mg, Ti), MTS-6 ((LiF)-Li-6:Mg, Ti), MTS-N ((LiF)-Li-nat:Mg, Ti) and TLD-700 ((LiF)-Li-7: Mg, Ti), radiophotoluminescent (RPL) detectors GD-352M and GD-302M, and polyallyldiglycol carbonate (PADC)-based (C12H18O7) track-etched detectors. Neutron and gamma-ray doses, as well as linear energy transfer distributions, were experimentally determined at 200 points within the phantom. In parallel, the Geant4 Monte Carlo code was applied to calculate neutron and gamma radiation spectra at the position of each detector. For the cubic proton target volume of 100 x 100 x 100 mm(3) (spread out Bragg peak with a modulation of 100 mm) the scattered photon doses along the main axis of the phantom perpendicular to the primary beam were approximately 0.5 mGy Gy(-1) at a distance of 100 mm and 0.02 mGy Gy(-1) at 300 mm from the center of the target. For the neutrons, the corresponding values of dose equivalent were found to be similar to 0.7 and similar to 0.06 mSv Gy(-1), respectively. The measured neutron doses were comparable with the out-offield neutron doses from a similar experiment with 20 MV x-rays, whereas photon doses for the scanning proton beam were up to three orders of magnitude lower.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30224 - Radiology, nuclear medicine and medical imaging

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics in Medicine and Biology

ISSN

0031-9155

e-ISSN

—

Svazek periodika

63

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

000430476400007

EID výsledku v databázi Scopus

2-s2.0-85046457369